JP2009151209A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which can effectively use light. <P>SOLUTION: Liquid crystals forming pixel portions 12, 14 of a light transmission scattering type liquid crystal 7 are orientated to be parallel to a polarization axis of a polarization light source 17 from a first direction and form, on a surface of a thin film-shaped electrode 1, a micro grating as compared to the wavelength of a polarization light source light 21. Thus, the polarization light source light 21 is reflected between the rear surfaces of the thin film-shaped electrode 1 and the light transmission scattering type liquid crystal 7 and then reflected by an inclined portion 1a of the thin film electrode 1 so as to come into a pixel portion 13 in the region where the inclined portion 1a of a light transmission scattering type liquid crystal panel 8 is formed and is spread/emitted as a radiation light 16. It should be noted that by adjusting the position of the inclined portion 1a, it is possible to control the position of the display pixel portion 13 from which the radiation light 16 is emitted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device, and in particular, a light source system capable of modulating the brightness by an input video signal and its R, G, B output light to be output / irradiated to pixels constituting a predetermined horizontal scanning line, and by line sequential scanning. The present invention relates to a display device (display device) that displays an image.

  In recent years, LCD type displays have been actively used. Furthermore, as a next-generation display device, for example, a display device using a light transmission / scattering type liquid crystal has been proposed (see Patent Document 1). As a basic principle of this display device, the relationship between the polarization characteristic of incident light of the light transmission / scattering type liquid crystal and the electro-optical polarization characteristic of the liquid crystal is utilized, and these two basic principles are merged.

  That is, the display structure of Patent Document 1 includes a light source system for reproducing all pixels for one line in the horizontal scanning line direction capable of luminance modulation by an input video signal, as shown in FIG. 1A of Patent Document 1. A mechanism for outputting light converted into p- or s-polarized light in the light source system, and the output light of the light source system for reproducing all pixels for one line in the horizontal scanning line direction is displayed on the user viewing side A device having a function of non-displaying and a function of scanning the output light of the light source system line-sequentially, and a drive circuit (not shown) for operating the function. As a mechanism for scanning the output light of the light source system line-sequentially, for example, a mechanism that moves within the liquid crystal layer by utilizing the electro-optical characteristics of the light transmission scattering type liquid crystal, and a drive control that performs the movement in association with the display A circuit may be provided.

  Further, as a technique using a method of bending the light emission direction from the display device by 90 degrees with respect to the incident direction, there is a technique described in Patent Document 2, for example.

  As shown in FIG. 8, the optical switch function unit of Patent Document 2 includes a light beam direction changing member 201. The light beam direction changing member has conductivity such as a metal material, a polymer material, and an inorganic material. A bendable film or thin film can be used. For example, a TiNi thin film is used, and the thickness of the thin film is 4 μm. At least one surface of the thin film is used as a mirror surface to form a reflecting portion. A thin film of TiNi alloy has corrosion resistance, is soft, and has superelasticity that is difficult to undergo plastic deformation. Since the thin film of TiNi alloy is a shape memory alloy, it can memorize the state of curvature and can maintain the previous state even during a power failure.

  On the other hand, the attracting portions 204 (3, 4) and 205 (5, 6) can attract the light beam direction changing member. For example, the two attracting portions 204 (3, 4) and 205 (5, 6) are arranged to face each other, and the light beam direction changing member 201 is arranged in a space between them. The attracting portions 204 (3, 4) and 205 (5, 6) include attracting means (actuators: 3 to 6) for attracting the light beam direction changing member 201.

  The attracting means may be any means that can attract the light beam direction changing member. For example, means such as an electric field, a magnetic field, and air may be used. When the attracting means uses an electric field, a large number of electrodes are arranged side by side along the longitudinal direction of the light beam direction changing member in each pair of attracting portions. For example, a number of parallel electrodes are mounted side by side along the direction of the incident light. The minimum moving distance of the bending portion is determined by the density of the number of electrodes. By applying a voltage to the electrode, for example, 500 V (an example in which the TiNi alloy thin film is used and the distance between the attracting portions is 1 mm) and grounding the light beam direction changing member, the light beam direction changing member has an electrostatic attractive force. The light beam direction changing member can be electrically attracted to the electrode. When using an electrode, in order to insulate between an electrode and a light beam direction change member, a non-contact layer is arrange | positioned between an electrode and a light beam direction change member. Further, even when direct contact between the suction means and the light beam direction changing member is not preferable, a non-contact layer is disposed between them. When air is used for suction, the light beam direction changing member can be sucked into the attracting portion by arranging an aspirator for sucking in the attracting portion.

  In addition, when using a magnetic field, you may use the method of attaching a magnet or another magnetic body to at least one of a beam direction change member or an attracting part, for example. In that case, a device for generating electromagnetic induction is arranged to attract or separate magnets or other magnetic materials. The device that generates electromagnetic induction may be attached to, for example, the attracting unit, but may be attached to the light beam direction changing member or both as required. When a magnet is attached to at least one and a magnet or other magnetic body is attached to the other, a self-holding function can be provided, and for example, a state can be held without applying external energy such as energization. If the self-holding function is unnecessary, a magnetic body other than a magnet is attached to one side, and a device that generates electromagnetic induction is attached to the other side.

  The attracting part is provided with a transmission part through which the light beam can be transmitted at a place where the light beam passes. For the transmission part, for example, a transparent member such as ITO or glass can be used, and a space through which light can pass can be provided in the attracting part. Thereby, light can be emitted from a desired location.

JP 2007-183559 A JP 2004-240308 A

  FIG. 9 is a diagram illustrating an example of an ideal operation mechanism when the optical switch mechanism described in Patent Document 2 is applied to a display of the type described in Patent Document 1. In FIG. When the optical switch function as described above is ideally operated, as shown in FIG. 9, insulator films provided on the inner surfaces of the first substrate 8 and the second substrate 11 arranged to face each other, respectively. The incident light 202 traveling along the substrate surface in the space formed between 9 and 10 is reflected by the thin film-like mirror electrode 201 disposed between the insulator films 9 and 10 to display substantially perpendicular to the substrate surface. The light 203 is configured. FIG. 10 is a diagram schematically showing the problem of the configuration shown in FIG. Actually, the incident light is not completely parallel light. Actually, as shown by reference numeral 208, the incident light loses parallelism by being reflected by the insulating films 9 and 10 in the space, and the thin mirror-like electrode 201 The component of the reflected light that is not perpendicular to the substrate surface increases (209).

  Therefore, in the structure shown in FIG. 9, the optical switch function unit is made lighter, thinner, and smaller, and it can be seen that there are problems in the diameter, parallelism, and linearity of the light source luminous flux when actually used in a display.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device with high light utilization efficiency that does not depend on the diameter, parallelism, linearity, etc. of the light source beam. Another object of the present invention is to provide a double-sided display function of a display device.

  According to one aspect of the present invention, a first substrate, a second substrate that is spaced apart from the first substrate by a certain distance, and the first substrate and the second substrate A light guide mechanism provided in a space formed therebetween, and performing display with pixels arranged in a matrix on a two-dimensional plane of the substrate, wherein the first substrate includes the first substrate A light transmission / scattering type liquid crystal panel provided on the opposite side of the second substrate, a plurality of transparent first electrodes provided on the second substrate side and arranged side by side in the pixel column direction, and the electrodes A first insulator film provided on a second substrate side, and the second substrate is provided on the first substrate side and is arranged side by side in a pixel column direction. A plurality of second electrodes forming electrode pairs with the plurality of electrodes; and the first substrate of the second plurality of electrodes. The light guide mechanism is a thin film electrode disposed between the first substrate and the insulator film provided on the second substrate. Extending in the same direction as the first and second plurality of electrodes provided on the first substrate and the second substrate, respectively, and the voltage applied to the first and second plurality of electrodes Between the first region in surface contact with the first insulator film surface, the second region in surface contact with the second insulator film surface, and the first region and the second region An input video signal having an inclined surface inclined with respect to the substrate surface, a plurality of diffraction gratings formed on the surface on the first substrate side, and a strip-like thin film electrode having a light reflecting function The light transmission / scattering liquid crystal panel disposed on the first substrate is turned on / off based on The first voltage control mechanism capable of moving the pixel region in the column direction, and applying a voltage to the first plurality of electrodes and the second plurality of electrodes to cause the inclined portion of the thin film electrode to move in the column direction The polarized light is introduced in the column direction between the second voltage control mechanism that can be moved and the insulator films disposed on the first substrate and the second substrate that are the light guide mechanism. A light source system including a light source that introduces light in a first direction disposed at a position; and a polarized light from the light source, and a scattering region of the light transmission / scattering type liquid crystal panel by the first voltage control mechanism; And a synchronous control unit that synchronizes the timing of voltage application between the first voltage control mechanism and the second voltage control mechanism so that the region where the inclined part is formed is formed at the same position. Provided by a display device characterized by Is done. The diffraction grating preferably has a sufficiently small pitch with respect to the wavelength of incident light.

  The first voltage control mechanism is configured to obtain a plurality of electro-optical characteristics in each of a plurality of stripe-shaped liquid crystal layers defined by the thin film electrode and the light transmission / scattering type liquid crystal substrate. On / off control of the voltage applied to the electrode. The light transmission / scattering type liquid crystal material is configured to control a polarization direction of light introduced from the light source system in the first direction, and to control a voltage between electrodes in the light transmission / scattering type liquid crystal panel by turning on / off. The light is emitted from a predetermined pixel based on the scattering. The second voltage control mechanism drives the thin film electrode, controls the direction of polarized light introduced from the light source system in the first direction, and inputs it to the pixel of the light transmission / scattering type liquid crystal. When the output light of the light source system is s-polarized light, the light from the light source is aligned by aligning the polarization axis of the light transmission / scattering liquid crystal of the light transmission / scattering liquid crystal panel in parallel with the output light. Propagates between the first substrate and the second substrate. When the output light of the light source system is p-polarized light, the light transmission / scattering liquid crystal panel of the light transmission / scattering liquid crystal panel is aligned with the polarization axis of the light transmission / scattering liquid crystal perpendicular to the polarization axis of the light from the light source. Propagating between the first substrate and the second substrate.

  By the respective applied voltages through the respective insulator films between the first plurality of electrodes and the second plurality of electrodes disposed on the thin film electrode and the first substrate and the second substrate, The position of the inclined portion of the thin film electrode is changed by tilting the thin film electrode at a predetermined angle and changing the position where the voltage is applied to the first and second electrodes. Can be adjusted. The light source has a mechanism for converting the light flux of the light source into a rectangular shape and a flat shape and unipolarizing into p-polarized light or s-polarized light.

  Further, in a space formed between the first substrate, the second substrate disposed opposite to the first substrate by a certain distance, and the first substrate and the second substrate. A display device that performs display with pixels arranged in a matrix on a two-dimensional plane of the substrate, wherein the first substrate is opposite to the second substrate A light transmission / scattering type liquid crystal panel provided on the second substrate side, a plurality of transparent first electrodes arranged on the second substrate side and arranged side by side in the pixel column direction, and provided on the second substrate side of the electrodes The second substrate is provided on the side opposite to the first substrate and the light transmission / scattering liquid crystal panel provided on the side opposite to the first substrate. A second plurality of electrodes arranged side by side in the pixel column direction to form an electrode pair with the first plurality of electrodes And a second insulator film provided on the first substrate side of the second plurality of electrodes, and the light guide mechanism includes the first substrate and the second substrate. A thin film electrode disposed between insulator films provided on the first substrate and extending in the same direction as the first and second plurality of electrodes provided on the first substrate and the second substrate, respectively. A first region in surface contact with the first insulator film surface by a voltage applied to the first and second electrodes, and a second region in surface contact with the second insulator film surface. And a large number of diffraction gratings formed on both sides of the first and second substrates, having an inclined surface inclined with respect to the substrate surface between the first region and the second region. The first and second substrates having a strip-like thin film electrode having a light reflection function and based on an input video signal A first voltage control mechanism capable of moving a pixel region in a column direction by turning on and off the light transmission / scattering liquid crystal panel disposed; the first plurality of electrodes; and the plurality of second electrodes; Arranged on the first substrate and the second substrate, which are the light guide mechanism, and a second voltage control mechanism capable of moving the inclined portion of the thin film electrode in a column direction by applying a voltage to the thin film electrode A light source system including a light source that introduces light in the first direction and the second direction, which is disposed at a position where the polarized light is introduced in the row direction between the formed insulator films, and polarized light from the light source The first voltage control mechanism and the first voltage control mechanism and the first voltage control mechanism and the first voltage control mechanism and the first voltage control mechanism and the first voltage control mechanism and the first voltage control mechanism and the first voltage control mechanism Voltage application timing with 2 voltage control mechanisms A double-sided display device comprising: a synchronization control unit that synchronizes the synchronization.

  In the plurality of thin film electrodes, the plurality of thin film electrodes, and the plurality of stripe-shaped liquid crystal layers defined by the light transmission / scattering liquid crystals provided on the first substrate side and the second substrate side, respectively. A third voltage control mechanism for controlling on / off of voltages applied to the plurality of electrodes is provided so as to obtain a plurality of electro-optical characteristics in each. Further, the polarization direction of light introduced from the light source system in the first direction and the second direction is controlled, and each of the light transmission / scattering types provided on the first substrate side and the second substrate side is provided. The light is emitted from a predetermined pixel on the basis of scattering of the light transmission / scattering liquid crystal material in which a voltage between electrodes in the liquid crystal panel is controlled by on / off. Further, the plurality of thin film electrodes are driven, the direction of polarized light introduced from the light source system in the first direction and the second direction is controlled, and the first substrate side and the second substrate side are controlled. A fourth voltage control mechanism for inputting to the pixels of each of the light transmission / scattering liquid crystal panels provided is provided.

  The display device according to the present invention can realize a very thin display panel. Further, since a backlight is not required, the display structure can be realized with a light transmission / scattering type liquid crystal panel thickness (about 2 to 3 mm).

  In addition, the display device according to the present invention has an advantage that it can be displayed on both sides using a single display panel.

  Hereinafter, display devices according to embodiments of the present invention will be described with reference to the drawings. The left figure of FIG. 13 is a figure which shows the diffraction efficiency of the diffraction grating (micro pitch diffraction grating) which has the dimension shown in the right figure of FIG. The horizontal axis represents the period T (related to the wavelength λ) and the vertical axis represents the diffraction efficiency. As shown in FIG. 13, the diffraction efficiency of a diffraction grating having a sufficiently small pitch with respect to the wavelength λ of incident light is 100%, and it can be seen that light propagation without loss is possible. The inventor has come up with the idea of using this principle for display devices. It is generally known that the pitch of the diffraction grating should be ≦ 0.2λ.

  From this, assuming that the minimum input wavelength is 400 nm, the pitch of the diffraction grating formed on the surface of the strip-shaped thin film electrode arranged in the light guide may be 80 nm or less. It turns out that it is a level that can be produced. The pitch of the diffraction grating formed of the light transmission / scattering type liquid crystal sealed on the second substrate corresponds to the pitch between liquid crystal molecules, and is about 2 nm, so that the diffraction grating has no reflection loss. Accordingly, the incident light shown in FIGS. 9 and 10 propagates without loss while being repeatedly reflected in the light guides formed on the upper and lower surfaces, and is reflected as shown in FIG. It is possible to efficiently output from the scattering type liquid crystal surface.

  Hereinafter, embodiments of the present invention will be described more specifically. First, an overall configuration example of a single-sided display device will be described. Since the principle is the same in the case of double-sided display, the drawings that can be shared are omitted.

  FIG. 1 is a diagram illustrating a configuration example of a display device according to the present embodiment. As shown in FIG. 1, the basic configuration of the display apparatus 100 according to the present embodiment is the polarized light source system 102 described above, a first substrate, which is defined by a plurality of optical switch function rows 106 and internal electrodes. A light transmission / scattering liquid crystal panel 101 in which pixels are set, a drive system 103 thereof, an optical switch function drive system 104, and a second substrate 105. The second substrate 105 is provided with a plurality of electrodes for driving the thin film electrodes.

  Hereinafter, the display device according to this embodiment will be described in detail. FIG. 2 is a transparent perspective view of the display device centering on the strip-shaped thin film electrode 1 in the first embodiment, and shows the arrangement direction of the thin film electrodes 1. FIG. 3 is a cross-sectional view showing a configuration example of the light guide mechanism in the first embodiment. As shown in FIG. 2, the display device (partial view) has pixel columns 112, 113, and 114 (only three columns are shown in the figure) extending along the traveling direction of incident light as shown in FIG. 3. In addition, in the light guide mechanism according to the present embodiment, the first substrate 8 is a light transmission / scattering liquid crystal panel 7. Driving transparent electrodes 3 and 4 for driving the thin film electrode 1 are provided on the back surface (inner surface side) of the first substrate 8. The inner surface side is covered with an insulator film 9.

  The second substrate 11 is transparent, and driving electrodes 5 and 6 for driving the thin film electrode 1 are provided on the upper surface (inner surface side), and these are covered with the insulator film 10.

  Further, in the space 17 formed between the insulator film 9 on the first substrate 8 side and the insulator film 10 on the second substrate 11 side, the diffraction grating 2 is formed on the surface on the first substrate 8 side. The thin film-like electrode 1 in which is formed is disposed to form a light guide mechanism.

  Next, description will be made with reference to FIG. As shown in FIG. 4, a plurality of transparent electrodes 3 and 4 (here, a plurality of electrodes are collectively shown by reference numerals 3 and 4) provided on the back side (inner surface side) of the first substrate 8 and Of the transparent electrodes 5 and 6 provided on the surface of the second substrate 11 (here, a plurality of electrodes are grouped and indicated by reference numerals 5 and 6), the voltage applied to the transparent electrodes 4 and 5 Thus, the thin film electrode 1 disposed in the space between the first substrate 8 and the second substrate 11 is attracted to the first transparent electrodes 4 and 5. The portion between them is disposed in the space 25 between the first substrate 8 and the second substrate 11, and is inclined at a predetermined angle with respect to the substrate surface in this space 25. FIG. 4 is a diagram showing a state of the display device operation according to the present embodiment. The alignment of the liquid crystal forming the pixel portions 12 and 14 of the light transmission / scattering liquid crystal panel 7 is parallel to the polarization axis of the polarized light source light 21 from the first direction and at the wavelength of the polarized light source light 21. In comparison, since the ultrafine grating is formed on the surface of the thin film electrode 1 as described above, the polarized light source light 21 is reflected between the back surface of the thin film electrode 1 and the light transmission / scattering type liquid crystal panel 7, and the thin film electrode 1 travels in the space 25 while being reflected by the inclined portion 1 a, enters the pixel portion 13 on the region where the inclined portion 1 a of the light transmission / scattering liquid crystal panel 8 is formed, and is diffused and radiated as emitted light 16. It is configured as follows. It should be noted that the position of the pixel portion 13 corresponding to the position from which the radiated light 16 is emitted can be controlled by adjusting the formation position of the inclined portion 1a.

  FIG. 5 is a diagram showing a state of driving the thin film electrode 1 of the display device according to the present embodiment for FIG. 2 in a row following FIG. 4, and Table 1 shows the position of the thin film electrode in FIG. It is a table | surface which shows the relationship between an upper side drive electrode and a lower side drive electrode.

  As shown in FIG. 5A, the thin film electrode 1 having the diffraction grating 2 formed on the upper surface is a view showing a state where it is provided at the position A. In this case, when the pixel to be displayed is denoted by reference numeral 13, the upper drive electrode group 1 = a) is turned off, the upper drive electrode group 2 = b) is turned on, and the upper drive electrode group 3 = c) is turned on. On, the lower drive electrode group 4 = d) is on, the lower drive electrode group 5 = e) is off, the lower drive electrode group 6 = f) is off, and the lower drive electrode 7 = g) is also When the electrode is off and one of the electrodes is on and the other is off, the thin film electrode 1 is attracted to the on side, which is basically not present when both are on, and is floating when both are off The region can be an inclined portion. 5A, the inclined portion A is formed in the pixel portion 13 and the incident light 21-25 becomes the outgoing light 22. In FIG. 5B, the inclined portion B is formed in the pixel portion 16 and the incident light 21-. In FIG. 5C, a voltage is applied to the electrode group so that the inclined portion C is formed in the pixel portion 19 and the incident light 21-25 becomes the emitted light 24.

  In synchronism with these operations, in the light transmission / scattering liquid crystal panel 7, as the regions where the inclined portions are formed move to A, B, and C, the positions of the display pixels are denoted by reference numerals 13, 16, It is configured to move as indicated at 19. By these operations, the radiated lights 22, 23, and 24 are radiated and scattered from the predetermined pixels toward the display direction (upper side in the drawing) from the positions of the transparent electrodes 13, 16, and 19, respectively. The alignment of the pixel parts 12, 13, and 14 of the light transmission / scattering type liquid crystal at this time will be described later.

  Insulator films 9 and 10 are disposed between the transparent electrodes 3, 4, 5, 6 provided on the first substrate 1 and the second substrate 2 and the thin film electrode 1, and are transparent. A short circuit between the electrodes 3, 4, 5, 6 and the thin film electrode 1 is prevented. An example of an appropriate insulating film that does not short-circuit and the thickness are preferably about 1 to 2 μm, for example.

  Next, the structure and operation of the light transmission / scattering type liquid crystal in the case of s-polarized input light will be described. FIG. 11 is a diagram showing an example of alignment of the light transmission / scattering type liquid crystal in this case, and is a diagram showing an example when the light source light is s-polarized light.

(1) Display Method of Pixel 13s in FIG. 5 FIG. 11 is a diagram showing the alignment state of the light transmission / scattering type liquid crystal, and the lower diagram is a cross-sectional view along the line AA ′ in the upper diagram. is there. This will be described with reference to FIG. The input light 21 s is oriented as indicated by reference numerals 60 and 62 by the voltage applied between the side electrodes 50 arranged on the partition walls of the light transmission / scattering liquid crystal panel unit 7 to form the diffraction grating parts 12 s and 14 s. To do. The diffraction grating portions 12s to 14s are indicated by broken lines. The following diffraction grating portions 12s and 14s and the diffraction grating 2 of the thin film electrode 1 in FIG. 4 are all diffraction gratings, but the diffraction grating formed in the light transmission / scattering type liquid crystal is obtained by liquid crystal molecular alignment. It is what The diffraction grating on the thin film electrode surface is physically formed. The pitch of the grating is less than the wavelength.

  Further, the side electrode pairs disposed on the side wall surrounding the light transmission / scattering type liquid crystal are generally adjacent to each other in a state where they overlap each other by a predetermined width. An insulator is inserted in the overlap region. In addition, the light source system includes a light source that can be modulated in luminance by an input video signal, a first condenser lens, a glass rod, and a second condenser lens or a polarization converter that is bonded to a polarization conversion element. And a condenser lens. The surface of the glass rod other than the incident / exit surface is mirrored.

  The output light of the light source system capable of modulating the luminance by the input video signal is reflected by the thin film electrode and input to the light transmission / scattering type liquid crystal substrate. And it can output to the pixel which comprises a predetermined horizontal scanning line, and can display and reproduce an image by line sequential scanning. The thin film-like electrodes are arranged at right angles to each of the R, G, and B pixels formed by sealing the light transmission / scattering type liquid crystal so as to avoid the incident direction of the emitted light. A control mechanism is provided for on / off control of each of the substrate and the thin film electrode. By this control mechanism, light can be emitted from a desired pixel based on the scattering of the light transmission / scattering type liquid crystal obtained by controlling the direction of the output polarized light.

As shown in FIGS. 5A and 14, the input light 21 s is totally reflected by the diffraction grating portion 12 s, reflected by the inclined portion A of the thin film electrode 1, travels to the first substrate 8 side, and is transmitted and scattered. The input light 80s is input to the pixels 13s of the mold panel unit 7. As shown in the center state of FIG. 11, the pixel 13 s is not applied with a voltage and the liquid crystal molecules are in a scattering state. Therefore, the input light 80 s shown in FIG. Scattered from.
The user can recognize this scattered light as display light.

(2) Next Pixel Display Method As shown in FIG. 11, when a pair of side electrode pairs 50 and 51 are connected by switches 54 and 55, respectively, and a predetermined voltage is applied to the electrodes, a diffraction grating portion of a light transmission / scattering type liquid crystal 12s becomes longer in the vertical scanning direction, and the diffraction grating portion 14s becomes shorter.

  Therefore, the total reflection position of the input light 21s moves by one pixel in the vertical direction. At the moved pixel position, the scattered light can be recognized as display light on the same principle as the display of the pixel 13s. The term “total reflection position” also refers to the diffraction grating surface formed on the light transmission / scattering type liquid crystal and the diffraction grating surface formed on the thin film electrode surface.

(3) Secondary pixel display method When the side electrodes 50, 51, and 52 are connected by switches 54, 55, 56, and 57, respectively, and a predetermined voltage is applied to the side electrodes, the light transmission / scattering type liquid crystal diffraction grating portion 12s. Becomes longer in the vertical direction, and the diffraction grating portion 14s becomes shorter. Therefore, the total reflection position of the input light 21s further moves by one pixel in the vertical direction. At the moved pixel position, the scattered light can be recognized as display light on the same principle as the display of the pixel 13s.

  The timing of the applied voltage between the side electrodes 50 and the timing of applying the voltage to the driving transparent electrode are controlled so that the position of the pixel 13s and the position of the reflecting portion of the strip-shaped thin film electrode portion are the same. The A control circuit for controlling such a drive circuit may be provided.

  In the case of p-polarized light, the control circuit applies an AC voltage between the electrodes 70, 71, 72 as shown in FIG. For example, even-numbered electrodes such as 70 and 72 are made common, and odd-numbered electrodes such as 71 and 73 are made common, and are connected so as to have different polarities.

  Next, the structure and operation of the light transmission / scattering type liquid crystal when the input light is p-polarized light will be described. FIG. 12 is a diagram illustrating an example of alignment of the light transmission / scattering type liquid crystal when the input light is p-polarized light, and corresponds to FIG. 11. FIG. 15 corresponds to FIG.

(1) Display Method of Pixel 13p FIG. 12 shows the alignment state of the light transmission / scattering type liquid crystal, and the lower figure is a cross-sectional view along the line BB ′ in the upper figure.

  The input light 21p is oriented as indicated by reference numerals 74 and 76 by the voltage applied between the planar electrodes 70-71 and 72-73 disposed on the back surface of the front substrate of the light transmission / scattering liquid crystal panel unit 7, A diffraction grating portion 12p is formed.

  The input light 21p is totally reflected by the diffraction grating portion 12p, reflected by the inclined portion of the thin film electrode 1, and input as input light 80p to the pixel 13p of the light transmission / scattering panel portion 7. Since the pixel 13p is in a scattering state when no voltage is applied, the input light 80p is scattered from the surface of the light transmission / scattering liquid crystal panel unit 7. The user can recognize the scattered light as the display light 16.

(2) Next Pixel Display Method When a predetermined voltage is applied between the side electrode pairs 70-71 and 71-72, the diffraction grating portion 12p of the light transmission / scattering type liquid crystal becomes longer in the vertical direction, and the diffraction grating portion 14p becomes Shorter. The total reflection position of the input light 21p moves by one pixel in the vertical direction. Since it is the same as the display of the pixel 13p, description is abbreviate | omitted.

(3) Next pixel display method When a predetermined voltage is applied between the side electrodes 70-71, 71-72, and 72-73, the diffraction grating portion 12p of the light transmission / scattering type liquid crystal is further elongated in the vertical direction. Thus, the diffraction grating portion 14p is further shortened. Since it is the same as the display of the pixel 13p, description is abbreviate | omitted.

  Next, a display device according to the second embodiment of the present invention will be described. Since the basic configuration and basic operation of the display device according to the present embodiment are the same as those of the display device according to the first embodiment, the description will focus on the differences. FIG. 6 is a diagram illustrating a configuration example of a display device centered on the light guide mechanism according to the present embodiment. As shown in FIG. 6, the diffraction grating 2 is provided not only on one side of the thin film electrode 1 but also on both front and back sides. Further, not only the first substrate 8 but also the second substrate 11 is provided with the same structure as the panel 7 using the light transmission / scattering type liquid crystal. Thereby, the polarized light source light is formed by the space defined by the first substrate 8 and the second substrate 11, and the first direction in the light guide portion that becomes the light introduction portion, and along the substrate surface. It is introduced in both the second direction which is the opposite direction (26, 28). The inclination angle is preferably about 45 degrees so that both are the same.

  As shown in FIG. 6, the polarized light source light introduced in this way is scattered display pixels of a light transmission scattering type liquid crystal panel enclosed in the first substrate 8 and the second substrate 11, respectively. It is configured to be able to radiate and diffuse simultaneously from the parts 31 and 34 (display light 27 and 29). In the display pixel units 31 and 34, the electrode groups 3 and 4 and the electrode groups 5 and 6 are based on voltages applied to a large number of electrode groups insulated by the insulating films 8 and 9, as in the first embodiment. And can be defined by ON / OFF of voltage application. The alignment of the pixel portions 30, 31, 32 (both sides) of the light transmission / scattering type liquid crystal at this time is the same as the configuration shown in FIG. The configuration of the thin-film electrode 1 is the same as that of the first embodiment except that the diffraction grating 2 is provided on both the front and back surfaces. FIG. 7 is a diagram for explaining in more detail how the incident lights 26 and 28 travel in the configuration of FIG. The incident lights 26 and 28 are diffracted by the diffraction grating of the thin film electrode 1 and scattered by the scattered light 27 and 29 from the display pixel unit 31 on the first substrate 8 side and the display pixel unit 34 on the second substrate side. Thus, the same screen can be viewed from both the first substrate 8 side and the second substrate 11 side. At this time, since the incident light is efficiently condensed on the display pixel portions 31 and 34 by the inclined portion and the diffraction grating, good display can be performed on both sides.

  Also in the display device according to the present embodiment described above, since the main optical system material is only the liquid crystal reflecting surface and the thin film electrode in the path from the signal light source to the scattering surface (display surface), the light transmittance is low. There is an advantage of improvement. Further, since a light source that emits a predetermined wavelength is used as the signal light source, a color filter is not necessary. Further, since the black level can be realized by setting the light emission of the signal light source to 0, it is theoretically possible to make the contrast ratio infinite.

  The display device according to the present embodiment is in principle a self-luminous type, the contrast ratio is not limited by the backlight luminance as in the TFT-LCD, and the signal light source is independent for each RGB pixel. Therefore, velocity luminance modulation similar to that of CRT or the like is possible.

  Therefore, there is an advantage that the contrast ratio of each adjacent pixel can be set freely. The contrast ratio between adjacent pixels is significantly improved as compared with the TFT-LCD.

  A very thin display panel can be realized. Since the backlight is unnecessary, there is an advantage that the display structure can be realized with a light transmission / scattering type liquid crystal panel thickness (about 2 to 3 mm).

  Further, there is an advantage that the color reproducibility is good. Since the signal light source is independent for each pixel, the degree of freedom in setting the chromaticity coordinate values of each color of RGB is high. For example, color reproducibility such as NTSC and HDTV can be reproduced faithfully.

  In addition, since the signal light source supports each pixel independently, a multi-primary color display that adds C (cyan), M (magenta), Y (yellow), etc. other than RGB will be realized in the process of future display evolution. can do.

  In addition, since the substrate material is black and less external light is reflected, a display capable of high-contrast display even in a bright room can be realized.

  In addition, the display device according to the present invention has an advantage that it can be displayed on both sides using a single display panel.

  The present invention is applicable to a display device and an electronic apparatus using the display device.

It is a figure which shows the example of whole structure of the display apparatus by the 1st Embodiment of this invention. It is a permeation | transmission perspective view centering on the strip | belt-shaped thin film electrode part in this Embodiment. It is sectional drawing which shows the structural example of the light guide mechanism part (light switch function part) in this Embodiment. It is a figure corresponding to FIG. 3, and is a figure which shows the course of light in detail. It is a figure which shows the mode of a drive of a strip | belt-shaped thin film electrode part. It is sectional drawing which shows the structural example of the light guide mechanism part (switch function part) in the double-sided display apparatus in the 2nd Embodiment of this invention. It is a figure corresponding to FIG. 6, and is a figure which shows the course of light in detail. It is a figure which shows the principle of the conventional optical switch function. It is sectional drawing which shows the structure of the conventional optical switch function part using a strip | belt-shaped thin film electrode. It is a figure which shows the operation example of the structure shown in FIG. It is a figure which shows the problem of the structure shown to FIG. It is a figure which shows the example of alignment of the light transmission scattering type liquid crystal by this Embodiment (when light source light is p polarization | polarized-light). It is a figure explaining the diffraction efficiency of the micro pitch diffraction grating by this Embodiment. It is a figure which shows the example of the electrode structure of the light transmissive scattering type liquid crystal panel adapted to input light (21s). It is a figure which shows the example of the electrode structure of the light transmission scattering type liquid crystal panel suitable for input light (21p).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Thin film-like electrode, 2 ... Diffraction grating, 3, 4 ... Transparent electrode for drive 5, 6 ... Electrode for drive, 7 ... Light transmission scattering type liquid crystal panel, 8 ... 1st board | substrate, 9 ... Insulator film, 10 ... insulator film, 11 ... second substrate, 17 ... space.

Claims (54)

Provided in a space formed between the first substrate, the second substrate disposed opposite to the first substrate by a certain distance, and the first substrate and the second substrate. A display device that performs display by pixels arranged in a matrix on a two-dimensional plane of a substrate,
The first substrate includes a light transmission / scattering liquid crystal panel provided on the opposite side of the second substrate, and a transparent first provided on the second substrate side and arranged in the pixel column direction. A plurality of electrodes, and a first insulator film provided on the second substrate side of the electrodes,
The second substrate is provided on the first substrate side, is arranged side by side in the pixel column direction, and is formed with an electrode pair with the first plurality of electrodes, and the second substrate And a second insulator film provided on the first substrate side of the plurality of electrodes,
The light guide mechanism is a thin film electrode disposed between insulator films provided on the first substrate and the second substrate, and is provided on each of the first substrate and the second substrate. A first region extending in the same direction as the first and second plurality of electrodes provided and in surface contact with the first insulator film surface by a voltage applied to the first and second plurality of electrodes; And a second region in surface contact with the second insulator film surface, and an inclined surface inclined with respect to the substrate surface between the first region and the second region, and the first region Having a strip-like thin film electrode having a number of diffraction gratings formed on the substrate side surface and having a light reflecting function,
A first voltage control mechanism capable of moving a pixel region in a column direction by turning on and off the light transmission / scattering type liquid crystal panel disposed on the first substrate based on an input video signal;
A second voltage control mechanism capable of moving the inclined portion of the thin film electrode in a column direction by applying a voltage to the first plurality of electrodes and the second plurality of electrodes;
Light is introduced in the first direction arranged in the column direction between the insulator films arranged on the first substrate and the second substrate, which are the light guide mechanism, in the column direction. A light source system including a light source to perform,
The polarized light from the light source is formed so that the scattering region of the light transmission / scattering type liquid crystal panel by the first voltage control mechanism and the region forming the inclined portion are formed at the same position. A display apparatus comprising: a synchronization control unit that synchronizes the timing of voltage application between the first voltage control mechanism and the second voltage control mechanism.   The display device according to claim 1, wherein the diffraction grating has a sufficiently small pitch with respect to a wavelength of incident light.   The first voltage control mechanism is configured to obtain a plurality of electro-optical characteristics in each of a plurality of stripe-shaped liquid crystal layers defined by the thin film electrode and the light transmission / scattering liquid crystal panel. The display device according to claim 1, wherein on / off control of a voltage applied to the electrode is performed.   The light transmission / scattering type liquid crystal material is configured to control a polarization direction of light introduced from the light source system in the first direction, and to control a voltage between electrodes in the light transmission / scattering type liquid crystal panel by turning on / off. The display device according to claim 1, wherein the light is emitted from a predetermined pixel based on scattering.   The second voltage control mechanism drives the thin film electrode, controls the direction of polarized light introduced from the light source system in the first direction, and causes the light transmission / scattering liquid crystal pixel to input the light. The display device according to claim 1, wherein the display device is a display device.   When the output light of the light source system is s-polarized light, the light from the light source is aligned by aligning the polarization axis of the light transmission / scattering liquid crystal of the light transmission / scattering liquid crystal panel in parallel with the output light. 6. The display device according to claim 1, wherein the display device propagates between the first substrate and the second substrate.   When the output light of the light source system is p-polarized light, the light transmission / scattering liquid crystal panel of the light transmission / scattering liquid crystal panel is aligned with the polarization axis of the light transmission / scattering liquid crystal perpendicular to the polarization axis of the light from the light source. The display device according to claim 1, wherein the display device propagates between the first substrate and the second substrate.   By the respective applied voltages through the respective insulator films between the first plurality of electrodes and the second plurality of electrodes disposed on the thin film electrode and the first substrate and the second substrate, The position of the inclined portion of the thin film electrode is changed by tilting the thin film electrode at a predetermined angle and changing the position where the voltage is applied to the first and second electrodes. The display device according to claim 1, wherein the display device is adjusted.   9. The display device according to claim 1, further comprising a mechanism that converts the light flux of the light source into a rectangular and flat shape and unipolarizes the light into p-polarized light or s-polarized light. 10.   A sealing material having a through hole for introducing output light from the light source into the inclined electrode surface of the thin film electrode formed between the first substrate and the second substrate is formed in the light guide portion. The display device according to claim 1, wherein the display device is a display device.   The pair of side electrodes disposed on the side wall surrounding the light transmission / scattering type liquid crystal is adjacent to each other in a state where they overlap each other by a predetermined width, and an insulator is interposed in the overlapping region. The display device according to claim 1.   In the light source system, a light source that can be modulated in luminance by an input video signal, a first condensing lens, a glass rod, and a second condensing lens in which a polarization conversion element is bonded, or a second condensing in which a polarization conversion element and a wave plate are bonded. The display device according to claim 1, further comprising a lens.   The display device according to claim 12, wherein a surface of the glass rod other than an incident / exit surface is mirror-processed.   The display device according to claim 1, wherein the scattering state region and the reflection state region are switched by a voltage applied to a side electrode surrounding the light transmission / scattering type liquid crystal. A light source system comprising the display device according to any one of claims 1 to 14 and capable of modulating a luminance by an input video signal, and output light of the light source system is reflected by the thin film electrode, and the light transmission scattering A system for inputting and outputting to a liquid crystal substrate, outputting to pixels constituting a predetermined horizontal scanning line, and displaying and reproducing an image by line sequential scanning,
For each R, G, B pixel formed by sealing a light transmission / scattering type liquid crystal, the thin film-like electrode disposed at a right angle at a position avoiding the incident direction of the emitted light;
A control mechanism for controlling on / off of each of the first and second substrates and the thin film electrode;
A display system characterized in that light is emitted from a desired pixel based on scattering of the light transmission / scattering type liquid crystal obtained by controlling the direction of the output polarized light by the control mechanism. Provided in a space formed between the first substrate, the second substrate disposed opposite to the first substrate by a certain distance, and the first substrate and the second substrate. A display device that performs display by pixels arranged in a matrix on a two-dimensional plane of a substrate,
The first substrate includes a light transmission / scattering liquid crystal panel provided on the opposite side of the second substrate, and a transparent first provided on the second substrate side and arranged in the pixel column direction. A plurality of electrodes, and a first insulator film provided on the second substrate side of the electrodes,
The second substrate includes a light transmission / scattering type liquid crystal panel provided on the opposite side of the first substrate, the first substrate provided on the first substrate side, and arranged side by side in the pixel column direction. A second plurality of electrodes forming an electrode pair with the second electrode, and a second insulator film provided on the first substrate side of the second plurality of electrodes,
The light guide mechanism is a thin film electrode disposed between insulator films provided on the first substrate and the second substrate, and is provided on each of the first substrate and the second substrate. A first region extending in the same direction as the first and second plurality of electrodes provided and in surface contact with the first insulator film surface by a voltage applied to the first and second plurality of electrodes; And a second region in surface contact with the second insulator film surface, and an inclined surface inclined with respect to the substrate surface between the first region and the second region, and the first region And a plurality of diffraction gratings formed on both surfaces of the second substrate side and a strip-like thin film electrode having a light reflecting function,
A first voltage control mechanism capable of moving a pixel region in a column direction by turning on and off the light transmission / scattering type liquid crystal panels disposed on the first and second substrates based on an input video signal;
A second voltage control mechanism capable of moving the inclined portion of the thin film electrode in a column direction by applying a voltage to the first plurality of electrodes and the second plurality of electrodes;
A first direction and a second direction arranged at a position for proceeding in the column direction and introducing polarized light between insulator films arranged on the first substrate and the second substrate as the light guide mechanism A light source system including a light source that introduces light in a direction;
The polarized light from the light source is formed so that the scattering region of the light transmission / scattering type liquid crystal panel by the first voltage control mechanism and the region forming the inclined portion are formed at the same position. A double-sided display device comprising: a synchronization control unit that synchronizes the timing of voltage application between the first voltage control mechanism and the second voltage control mechanism.   The double-sided display device according to claim 16, wherein the diffraction grating has a sufficiently small pitch with respect to a wavelength of incident light.   In the plurality of thin film electrodes, the plurality of thin film electrodes, and the plurality of stripe-shaped liquid crystal layers defined by the light transmission / scattering liquid crystals provided on the first substrate side and the second substrate side, respectively. 17. The double-sided display device according to claim 16, further comprising a third voltage control mechanism for controlling on / off of voltages applied to the plurality of electrodes so as to obtain a plurality of electro-optical characteristics in each of the plurality of electrodes. .   The light transmission / scattering type liquid crystal panels provided on the first substrate side and the second substrate side for controlling the polarization direction of light introduced from the light source system in the first direction and the second direction, respectively. 18. The double-sided display according to claim 16, wherein the light is emitted from a predetermined pixel based on scattering of the light transmission / scattering type liquid crystal material controlled by ON / OFF of a voltage between electrodes in the display. Display device.   The plurality of thin film electrodes are driven to control the direction of polarized light introduced from the light source system in the first direction and the second direction, and are provided on the first substrate side and the second substrate side. 20. The double-sided display device according to claim 17, further comprising a fourth voltage control mechanism for inputting to each pixel of the light transmission / scattering liquid crystal panel.   When the output light of the light source system is s-polarized light, the light transmission is caused by the voltage applied to the electrode pair of each of the light transmission / scattering liquid crystals provided on the first substrate side and the second substrate side. The polarization axis of the scattering-type liquid crystal is oriented horizontally with respect to the first substrate surface and the second substrate surface, and the output light of the light source system from the first direction and the second direction is the first light, respectively. The double-sided display device according to any one of claims 16 to 20, wherein the double-sided display device propagates between the second substrate and the second substrate.   When the output light of the light source system is p-polarized light, the light transmission is caused by the voltage applied to the electrode pair of each of the light transmission / scattering liquid crystals provided on the first substrate side and the second substrate side. The polarization axis of the scattering-type liquid crystal is made parallel to the output light p-polarized light from the first and second directions, and the output light of the light source system is output from the first direction and the second direction, respectively. The double-sided display device according to any one of claims 16 to 20, wherein the double-sided display device propagates between the first substrate and the second substrate.   17. A mechanism for converting a light beam of a light source from each of the light source systems propagating in the first and second directions into a rectangular shape and a flat shape and unipolarizing into p-polarized light or s-polarized light. The double-sided display device according to any one of items 1 to 22.   A through hole for the output light that is formed in the sealing material and is input from first and second directions provided between the first substrate and the second substrate for output light from the light source system; The double-sided display device according to any one of claims 16 to 23.   Side electrode pairs arranged on the side walls of the light transmission / scattering type liquid crystal panels on the first substrate side and the second substrate side are adjacent to each other in a state where they overlap each other by a predetermined width. The double-sided display device according to any one of claims 16 to 23, wherein an insulator is interposed in the region.   In the light source system, a second light source, a first condensing lens, a glass rod, and a polarization conversion element, each of which can modulate the luminance of the output light in the first direction and the output light in the second direction by an input video signal, respectively. The display device according to any one of claims 16 to 23, further comprising a condensing lens or a polarization conversion element and a second condensing lens bonded with a wave plate.   27. The double-sided display device according to claim 26, wherein a surface of the glass rod other than the incident / exit surface is mirrored.   The pair of side electrodes disposed on the side walls surrounding the light transmission / scattering type liquid crystal sealed in the first substrate and the second substrate are adjacent to each other in a state where they overlap each other by a predetermined width. The double-sided display device according to any one of claims 16 to 27, wherein an insulator is interposed in the wrapped region.   Each of the light source systems from the first and second directions has a light source that can be modulated in luminance by an input video signal, a first condensing lens, a glass rod, and a second condensing lens or a polarization converter. It has a 2nd condensing lens which bonded the element and the wavelength plate, The double-sided display apparatus of any one of Claim 16-28 characterized by the above-mentioned.   30. The double-sided display device according to claim 29, wherein a surface of the glass rod other than the incident / exit surface is mirrored. For each R, G, B pixel formed by sealing a light transmission / scattering type liquid crystal, the thin film-like electrode disposed at a right angle at a position avoiding the incident direction of the emitted light;
A control mechanism for controlling on / off of each of the first and second substrates and the thin film electrode;
29. The light emission from a desired pixel based on scattering of the light transmission / scattering type liquid crystal obtained by controlling the direction of the output polarized light by the control mechanism. The double-sided display device according to item.   By linking the input of the input video signal with the voltage control mechanism, the light source light output from the first and second directions is transmitted to the first substrate surface and / or the second substrate surface. 30. The double-sided display device according to any one of claims 16 to 29, further comprising a control unit that performs control to output in units of pixels.   The control unit performs control capable of controlling output of the light source light alternately or simultaneously from pixels located at the same position sandwiched between the first substrate surface and the second substrate surface in accordance with the input video signal. The double-sided display device according to claim 32.   An output light in which the light source light of the light source system is controlled to be p or s polarized light is introduced in a vertical scanning direction, and a space sandwiched between the insulating band film of the first substrate and the insulating band film of the second substrate is introduced. Propagating, reflecting on both surfaces of the thin film electrode having a predetermined inclination, and emitting to the light transmission dispersion type liquid crystal layer disposed on the first substrate side and the second substrate side, The light source light is emitted from a first substrate surface and a second substrate surface based on electro-optical characteristics of the light transmission / scattering liquid crystal material controlled by turning on / off an applied voltage. The double-sided display device according to any one of 16 to 27.   Output light in which the light source light of the plurality of light source systems corresponding to the number of display pixels is controlled to p or s polarized light is introduced in the vertical scanning direction, and the voltages at the two pairs of counter electrodes are controlled by on / off. The screen is formed by emitting the polarized light source light from the first substrate surface and the second substrate surface by line-sequential scanning based on the electro-optical characteristics of the light transmission / scattering liquid crystal material. Item 29. The double-sided display device according to any one of items 16 to 28.   Controlling the direction of polarized light introduced from the light source system in the first direction, and based on scattering of the light transmission scattering liquid crystal material controlled by turning on / off the voltage at the two pairs of counter electrodes 32. The double-sided display device according to any one of claims 16 to 31, wherein the light is emitted from a predetermined pixel from the first substrate surface and / or the second substrate surface.   When the output light from the light source system is s-polarized light, the polarization axis of the light transmission / scattering liquid crystal is made horizontal with respect to the first substrate surface by the voltage applied to the first and second counter electrode pairs. A thin-film electrode having a predetermined inclination is produced by propagating an output light of the light source system between the electrodes through a space sandwiched between the insulating band film of the first substrate and the insulating band film of the second substrate. 33. The voltage applying mechanism according to claim 16, further comprising: a voltage applying mechanism that reflects on both surfaces and emits the light to the light transmission dispersion type liquid crystal layer disposed on the first substrate side and the second substrate side. The double-sided display device according to item.   When the output light from the light source system is p-polarized light, the polarization axis of the light transmission / scattering liquid crystal is output in the first and second directions by the voltage applied to the first and second counter electrode pairs. Orienting perpendicularly to the polarized light source light, and the output light of the light source system propagates between the electrodes through a space sandwiched between the insulating band film of the first substrate and the insulating band film of the second substrate, It has a voltage application mechanism that reflects on both surfaces of a thin film electrode having a predetermined inclination and emits the light to the light transmission dispersion type liquid crystal layer disposed on the first substrate side and the second substrate side. The double-sided display device according to any one of claims 16 to 33.   The voltage applied to the first and second counter electrode pairs is such that output light that is p-polarized light or s-polarized light of the light source system is output from the exit surface of the pixel via an incident path to the pixel. The double-sided display device according to any one of claims 20 to 34, further comprising a voltage control mechanism for turning off both.   36. The device according to any one of claims 20 to 35, further comprising a one-sided polarization mechanism that converts a light beam of the light source from the light source system into a rectangular and flat shape and unipolarizes into p-polarized light or s-polarized light. Double-sided display device.   A through hole formed in a sealing material that seals the liquid crystal and that introduces output light from the light source system into a space sandwiched between the insulating band film of the first substrate and the insulating band film of the second substrate 37. The double-sided display device according to any one of claims 20 to 36, comprising:   The electrodes disposed on the side walls of the respective light transmission / scattering type liquid crystals disposed on the first and second substrates are disposed adjacent to each other in a state where they overlap each other by a predetermined width. 38. The double-sided display device according to any one of claims 16 to 37, wherein an insulator is interposed between the two-sided display device.   In the light source system, a light source that can be modulated in luminance by an input video signal, a first condenser lens and a glass rod, and a second condenser lens or a polarization conversion element on which a polarization conversion element is attached, and a wave plate are attached. The double-sided display device according to any one of claims 16 to 38, further comprising a second condenser lens.   44. The display device according to claim 43, wherein a surface of the screen on which the glass rod is formed excluding an incident / exit surface is mirror-processed.   A signal processing system capable of displaying the same content as the display content on the first substrate surface on the second substrate surface or displaying different display content on a single display panel, and the signal system, The double-sided display device according to any one of claims 16 to 43, comprising:     45. The apparatus according to claim 16, further comprising a scanning direction control unit capable of arbitrarily setting a horizontal scanning direction of each of the display surface of the first substrate and the display surface of the second substrate. An information processing apparatus comprising the double-sided display described above.   16. The method according to claim 1, wherein the scattering state region and the reflection state region are switched by a voltage applied to a side electrode of the first and second light transmission / scattering type liquid crystals. The display device according to any one of claims 16 to 46, and the double-sided display device according to any one of claims 16 to 46.   The display device according to any one of claims 1 to 16, wherein the light sources are arranged in different colors depending on adjacent light sources.   The double-sided display device according to any one of claims 17 to 47, wherein the light sources are arranged in different colors for adjacent light sources.   The light emitted from the adjacent light source to one side of the substrate is arranged in the same color along the second direction, and the light emitted from the opposite side of the substrate to the second direction The double-sided display device according to any one of claims 17 to 46, 48, wherein different color arrangements are provided along the line.   The light emitted to either one side or the other side of the substrate from the adjacent light source is alternately emitted along the second direction, 50 to 46, 48, 49 The double-sided display apparatus of any one of Claims. A light source system capable of modulating the luminance by an input video signal, and the output light of the light source system is reflected by the thin film electrode, input to the light transmission / scattering liquid crystal panel, and output to pixels constituting a predetermined horizontal scanning line. A system for displaying and reproducing an image by line sequential scanning,
For each R, G, B pixel formed by sealing a light transmission / scattering type liquid crystal, the thin film-like electrode disposed at a right angle at a position avoiding the incident direction of the emitted light;
A control mechanism for controlling on / off of each of the first and second substrates and the thin film electrode;
A double-sided display system characterized in that light is emitted from a desired pixel based on the scattering of the light transmission / scattering type liquid crystal obtained by controlling the first and second directions of the output polarized light by the control mechanism. . A light source system capable of modulating the luminance by an input video signal, and the output light of the light source system is reflected by the thin film electrode, input to the light transmission / scattering liquid crystal panel, and output to pixels constituting a predetermined horizontal scanning line. A system for displaying and reproducing an image by line sequential scanning,
For each R, G, B pixel formed by sealing a light transmission / scattering type liquid crystal, the thin film-like electrode disposed at a right angle at a position avoiding the incident direction of the emitted light;
A control mechanism for controlling on / off of each of the first and second substrates and the thin film electrode;
In the system capable of emitting light from a desired pixel based on scattering of the light transmission / scattering type liquid crystal obtained by controlling the first and second directions of the output polarized light by the control mechanism, the light 15. The display device according to claim 1, wherein the orientation of the transmission / scattering type liquid crystal can be switched horizontally or vertically with respect to the polarization axis of the output polarized light source light. A light source system capable of modulating the luminance by an input video signal, and the output light of the light source system is reflected by the thin film electrode, input to the light transmission / scattering type liquid crystal substrate, and output to pixels constituting a predetermined horizontal scanning line. A system for displaying and reproducing an image by line sequential scanning,
For each R, G, B pixel formed by sealing a light transmission / scattering type liquid crystal, the thin film-like electrode disposed at a right angle at a position avoiding the incident direction of the emitted light;
A control mechanism for controlling on / off of each of the first and second substrates and the thin film electrode;
In the system capable of emitting light from a desired pixel based on scattering of the light transmission / scattering type liquid crystal obtained by controlling the first and second directions of the output polarized light by the control mechanism, the light The double-sided display according to any one of claims 15 to 46, 48, and 49, wherein the orientation of the transmission / scattering type liquid crystal can be switched horizontally or vertically with respect to the polarization axis of the output polarized light source light. Display device.

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